_IOWR when errno != 0

[Xin LI]

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Hi,

Is there a sane way to copyout ioctl request when the returning errno !=
0?  Looking at the code, currently, in sys/kern/sys_generic.c, we have:

===========
        error = kern_ioctl(td, uap->fd, com, data);

        if (error == 0 && (com & IOC_OUT))
                error = copyout(data, uap->data, (u_int)size);
===========

Is there any objection if I change it to something like:

===========
        saved_error = kern_ioctl(td, uap->fd, com, data);

        if (com & IOC_OUT)
                error = copyout(data, uap->data, (u_int)size);
        if (saved_error)
                error = saved_error;
===========

Cheers,
- -- 
Xin LI <delphij at delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!	       Live free or die
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